Onex's middle-market PE platform ONCAP has completed the sale of Car Wash Partners ("Mister Car Wash") to Leonard Green & Partners. Operating 134 car washes and 32 lube centers in 14 U.S. states, Mister Car Wash employs 4,800 and services more than 15 million vehicles annually. ONCAP bought it in April 2007, and grew it through multiple acquisitions. Including prior distributions, ONCAP has received net proceeds of $423 million, a gross multiple of capital invested of about 8.1x and a gross IRR of 36%. From the sale alone, Onex received net proceeds of $153 million.